Kidou Senshi Crossbone Gundam

The year is Universal Century 0133. Ten years have past since the armed resistance of the aristocratic fraction, the Crossbone Vanguard, was subdued. Tobia Aronnax is an exchange student onboard the spaceship Smashion to Jupiter, but during a surprised attack by a group of space pirates who call themselves the Crossbone Vanguard, he finds out that there were actually hidden agendas among those in the Smashion and in Jupiter itself.